Browsing by Author "Palma Quilodrán, Gonzalo"

Now showing items 1-18 of 18

    • A proof of slow-roll local decay of inflaton fields in cosmology and axion fields in cold dark matter models 
      Morales Salinas, Matías Benjamín (Universidad de Chile, 2023)
      Este trabajo está basado en el estudio de las propiedades de decaimiento de campos provenientes de la teoría de inflación cósmica y la teoría de axiones en materia oscura fría (CDM). El problema concreto a estudiar se ...
    • Bayesian inference for precision cosmology: A machine learning approach 
      Grandón Silva, Daniela Ignacia (Universidad de Chile, 2023)
      La cosmología se encuentra actualmente en el estado afortunado de recopilar cada vez más datos y, en particular, datos cada vez más precisos. Esto, a su vez, implica que la estimación de numerosos parámetros cosmológicos ...
    • Bayesian statistical methods on large scale structure cosmology 
      Sagredo Briones, Bryan Lester (Universidad de Chile, 2018)
      En esta tesis se introduce el formalismo de la estadística Bayesiana aplicado a cosmología LCDM y otros modelos de energía oscura, enfocado en los observables de agrupamiento de galaxias y de crecimiento cósmico. Se explora ...
    • Consistency relations for sharp features in the primordial spectra 
      Mooij, Sander; Palma Quilodrán, Gonzalo; Panotopoulos, Grigoris; Soto, Alex (IOP Press, 2015)
      We study the generation of sharp features in the primordial spectra within the framework of effective field theory of inflation, wherein curvature perturbations are the consequence of the dynamics of a single scalar degree ...
    • Consistently violating the non-Gaussian consistency relation 
      Mooij, Sander; Palma Quilodrán, Gonzalo (IOP Press, 2015)
      Non-attractor models of inflation are characterized by the super-horizon evolution of curvature perturbations, introducing a violation of the non-Gaussian consistency relation between the bispectrum's squeezed limit and ...
    • Cumulative effects in inflation with ultra-light entropy modes 
      Achúcarro, Ana; Atal, Vicente; Germani, Cristiano; Palma Quilodrán, Gonzalo (Institute of Physics Publishing, 2017)
      In multi-field inflation one or more non-adiabatic modes may become light, potentially inducing large levels of isocurvature perturbations in the cosmic microwave background. If in addition these light modes are coupled ...
    • Data mining and machine learning algorithms in cosmology to optimize the constraining power of parameters ... 
      Silva Lafaurie, Javier Ignacio (Universidad de Chile, 2020)
      El objetivo de esta tesis es explorar algunos algoritmos de minería de datos y aprendizaje de máquinas aplicados a datos cosmológicos, especialmente a los observables obtenidos del agrupamiento de galaxias en la estructura ...
    • Effective field theory of weakly coupled inflationary models 
      Gwyn, Rhiannon; Palma Quilodrán, Gonzalo; Sakellariadou, Mairi; Sypsas, Spyros (IOP Publishing Ltd and Sissa Medialab srl, 2013-04)
      The application of Effective Field Theory (EFT) methods to inflation has taken a central role in our current understanding of the very early universe. The EFT perspective has been particularly useful in analyzing the ...
    • Features of heavy physics in the CMB power spectrum 
      Achúcarro, Ana; Gong, Jinn-Ouk; Hardeman, Sjoerd; Palma Quilodrán, Gonzalo; Patil, Subodh P. (Elsevier, 2011-01)
      The computation of the primordial power spectrum in multi-field inflaation models requires us to correctly account for all relevant interactions between adiabatic and non-adiabatic modes around and after horizon crossing. ...
    • Informed total-error-minimizing (item) priors: interpretable cosmological parameter constraints despite ... 
      Ried Guachalla, Bernardita (Universidad de Chile, 2022)
      Modern physical cosmology aims to understand the physics of the universe, i.e., the kinematical and dynamical processes, the contents, the structure, and the cosmic origin and evolution. To fully understand it, the ...
    • On the integration of fields and quanta in time dependent backgrounds 
      Castillo, Esteban; Koch, Benjamin; Palma Quilodrán, Gonzalo (Springer, 2014)
      Field theories with global continuous symmetries may admit configurations in which time translation invariance is broken by the movement of homogeneous background fields evolving along the flat directions implied by the ...
    • Primordial gravitational waves from excited states 
      Fumagalli, Jacopo; Palma Quilodrán, Gonzalo; Renaux-Petel, Sébastien; Sypsas, Spyros; Witkowskia, Lukas T.; Zenteno, Cristóbal (Springer, 2022)
      We show that a scalar excited state with large occupation numbers during inflation leads to an enhancement of tensor modes and a characteristic pattern of order-one oscillations in the associated stochastic gravitational ...
    • Radiación de Hawking en un fluido transónico - medición de propiedades termodinámicas de un sistema análogo 
      Sepúlveda Soto, Fabián Esteban (Universidad de Chile, 2019)
      En este trabajo, utilizando técnicas de fluidodinámica, son medidas las amplitudes de ondas de longitud corta en un canal con flujo constante y obstáculos, para así obtener las propiedades de un agujero blanco análogo ...
    • Relativistic effects in large scale structure 
      Barrera Hinojosa, Cristián Guzmaro (Universidad de Chile, 2018)
      En esta tesis estudiamos efectos relativistas en la estructura a gran escala del universo en $\Lambda$CDM y modelos de energía oscura. El término observado de sobredensidad de materia es derivado en el regimen lineal, donde ...
    • Scale invariance of the primordial tensor power spectrum 
      Palma Quilodrán, Gonzalo; Pradenas Márquez, Bastián; Riquelme, Walter; Sypsas, Spyros (American Physical Society, 2017)
      Future cosmic microwave background polarization experiments will search for evidence of primordial tensor modes at large angular scales, in the multipole range 4≤≤50. Because in that range there is some mild evidence of ...
    • Study and implementation of modifications to the pure B-mode pseudo-spectrum of the power spectrum estimator ... 
      Aguilar Faúndez, Mario Andrés Osvaldo (Universidad de Chile, 2021)
      Esta tesis describe el trabajo que yo he realizado para contribuir al desarrollo de la tubería de análisis de datos para procesar las observaciones del experimento Polarbear. El proyecto observó el Fondo Cósmico de Microondas ...
    • The effect of extra degrees of freedom on the primordial statistics of the Universe: Primordial features ... 
      Riquelme Chamblas, Walter Esteban (Universidad de Chile, 2018)
      The standard model of cosmology has some problems in order to describe the early stages of the universe. The theory of Cosmic Inflation, a phase of accelerated exponential expansion, was conceived to solve the previous ...
    • The role of primordial symmetries in the determination of the non-gaussian properties of our Universe 
      Bravo Guerraty, Rafael Fernando (Universidad de Chile, 2021)
      In this thesis, we show how future cosmological observations can provide us access to unveil the mechanism responsible for the origin of the structure in our universe. The primordial perturbations sourced by quantum vacuum ...